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This is an example of a completed Kropki Sudoku. Kropki Sudoku puzzles take place on a standard 9x9
Sudoku grid, but there is a mixture of black and white dots between the cells to tell you about the
relationship between the values in those cells,

- Black dots: One of these cells is double the value of the other cell.
- White dots: One of these cells is one bigger than the other cell, i.e. they are consecutive values

This is a starting Kropki Sudoku grid of medium difficulty. I have highlighted 2 cells that we can fill
in to start with.

The highlighted cell in the top-left is consecutive with the 8, i.e. the highlighted cell must be a 7
or a 9. The normal rules of Sudoku also apply and we can see that we already have a 7 in this column,
this means the highlighted cell must be a 9.

The highlighted cell at the bottom of the grid has two relationships we can look at,

- It is consecutive with 5, i.e. it must be 4 or 6.
- It is double or half of 3, i.e. it must be 1.5 or 6.

Sudoku

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16×16 Giant Sudoku

Hyper Sudoku

X-Sudoku

Greater Than Sudoku

Killer Sudoku

Center-Dot Sudoku

Odd-Even Sudoku

Arrow Sudoku

Consecutive Sudoku

SudokuXV

Kropki Sudoku

Samurai Sudoku

Thermo Sudoku

Renban Sudoku

Entropy Sudoku

Anti Knight Sudoku

Palindrome Line Sudoku

Nonograms

Picross

Nurikabe

Mathdoku

Hitori

Futoshiki

Towers

Maze

Network

Minesweeper

Hashi

SlitherLink

TicTacToe

CellBlocks

Suguru

Kakuro

Train Tracks

Battleships

Masyu

Light Up

Shakashaka

Fillomino

Numberlink

Suko

SetSquare

Dominosa

Spiral Galaxy

Hidoku

Star Battle

Kakurasu

Ballsort

HexaBlocks

SquareBlocks

TriangleBlocks

OneStroke

PipeConnect

PipeTurn

NumberMaze

MathGrid

Slant

Lits

Tents

Range

Shingoki

Tapa

NoriNori

Yajilin

Wordsearch

Solitare

Pairs

Four in a row